Our Website Is in Transition!
The new site offers updated and expanded versions
of the PRISM climate datasets, incorporating observations from new
station networks.
As the transition is underway, some previously available datasets have
not yet been recomputed or transferred. They remain available on the
old website in
case you need them.
We apologize for any inconvenience to you during the transition period.

The PRISM Climate Group gathers climate observations from a wide range of
monitoring networks, applies sophisticated quality control measures, and develops
spatial climate datasets to reveal short- and long-term climate patterns.
The resulting datasets incorporate a variety of modeling techniques and are
available at multiple spatial/temporal resolutions, covering the period from 1895
to the present. Whenever possible, we offer these datasets to the public,
either free of charge or for a fee (depending on dataset size/complexity and
funding available for the activity).

30-Year Normals: At the end of each decade, average
values for temperature and precipitation are computed over the preceding 30 years.
The current set of 30-year normals covers the period 1981-2010.

Comparisons: Maps showing how observed values have been deviating from long-term conditions (also known as anomalies) - includes the new Drought Indicator tool.

This Month: Although still very preliminary, results
based on daily data readings are available for the month-in-progress.

Prior 6 Months: Provisional
results based on both monthly and daily data are available for the 6 most recently
completed months.

Recent Years: Daily and monthly observations
become stabilized after 6 months. At that point the time series datasets are
posted in this section, along with annual values computed at the end of each year.

Historical Past: Values
prior to 1981 are based on less extensive observations. Time series datasets computed
using monthly modeling are available for the years 1895-1990.